Lubricants for vinyl chloride polymers

Abstract

Triglycerides containing hydroxy fatty acid residues, of the type obtainable by hydrogenating epoxidized natural fats and oils, are used as lubricants for the molding of polyvinyl chloride or copolymers predominantly containing vinyl chloride, and are a replacement for hardened castor oil.

We claim: 
     
       1. In the process of molding polyvinyl chloride or copolymers predominantly containing vinyl chloride wherein a molding lubricant is employed, the improvement comprising using a lubrication effective amount of a molding lubricant consisting essentially of triglycerides containing hydroxy fatty acid residues obtained by hydrogenating at least one epoxidized natural fat or oil selected from olive oil, linseed oil, sunflower oil, safflower oil, peanut oil, corn oil, palm oil, tall oil, lard oil, herring oil, whale oil, soybean oil, rapeseed oil, or tallow. 
     
     
       2. The process of claim 1 wherein said natural fat or oil is soybean oil, rapeseed oil, tallow, or any mixutre thereof. 
     
     
       3. The process of claim 1 wherein said triglycerides are used in a quantity of about 0.3 to 3.0 parts by weight per 100 parts by weight of said polymers or copolymers. 
     
     
       4. The process of claim 2 wherein said triglycerides are used in a quantity of about 0.3 to 3.0 parts by weight per 100 parts by weight of said polymers or copolymers. 
     
     
       5. The process of claim 1 wherein said triglycerides are used in a quantity of about 0.5 to 1.0 part by weight per 100 parts by weight of said polymers or copolymers. 
     
     
       6. The process of claim 2 wherein said triglycerides are used in a quantity of about 0.5 to 1.0 part by weight per 100 parts by weight of said polymes or copolymers. 
     
     
       7. A molding composition comprising polyvinyl chloride or copolymers predominantly containing vinyl chloride and about 0.3 to about 3.0 parts by weight per 100 parts by weight of said polyvinyl chloride or copolymers of a molding lubricant consisting essentially of trigylcerides containing hydroxy fatty acid residues obtained from the hydrogenation of at least one epoxidized natural fat or oil selected from olive oil, linseed oil, sunflower oil, safflower oil, peanut oil, corn oil, palm oil, tall oil, lard oil, herring oil, whale oil, soybean oil, rapeseed oil, or tallow. 
     
     
       8. The composition of claim 7 wherein said natural fat or oil is soybean oil, rapeseed oil, tallow or any mixture thereof. 
     
     
       9. The composition of claim 7 wherein said triglycerides are present in a quantity of about 0.5 to about 0.1 part by weight per 100 parts by weight of said polyvinyl chloride or copolymer. 
     
     
       10. The composition of claim 8 wherein said triglycerides are present in a quantity of about 0.5 to about 0.1 part by weight per 100 parts by weight of said polyvinyl chloride or copolymer.